/**************************************************************************** * net/local/local_sockif.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "local/local.h" #ifdef CONFIG_NET_LOCAL /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int local_setup(FAR struct socket *psock, int protocol); static sockcaps_t local_sockcaps(FAR struct socket *psock); static void local_addref(FAR struct socket *psock); static int local_bind(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen); static int local_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen); static int local_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen); #ifndef CONFIG_NET_LOCAL_STREAM static int local_listen(FAR struct socket *psock, int backlog); #endif static int local_connect(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen); #ifndef CONFIG_NET_LOCAL_STREAM static int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen, FAR struct socket *newsock); #endif static int local_poll(FAR struct socket *psock, FAR struct pollfd *fds, bool setup); static int local_close(FAR struct socket *psock); static int local_ioctl(FAR struct socket *psock, int cmd, unsigned long arg); static int local_socketpair(FAR struct socket *psocks[2]); static int local_shutdown(FAR struct socket *psock, int how); #ifdef CONFIG_NET_SOCKOPTS static int local_getsockopt(FAR struct socket *psock, int level, int option, FAR void *value, FAR socklen_t *value_len); static int local_setsockopt(FAR struct socket *psock, int level, int option, FAR const void *value, socklen_t value_len); #endif /**************************************************************************** * Public Data ****************************************************************************/ const struct sock_intf_s g_local_sockif = { local_setup, /* si_setup */ local_sockcaps, /* si_sockcaps */ local_addref, /* si_addref */ local_bind, /* si_bind */ local_getsockname, /* si_getsockname */ local_getpeername, /* si_getpeername */ local_listen, /* si_listen */ local_connect, /* si_connect */ local_accept, /* si_accept */ local_poll, /* si_poll */ local_sendmsg, /* si_sendmsg */ local_recvmsg, /* si_recvmsg */ local_close, /* si_close */ local_ioctl, /* si_ioctl */ local_socketpair, /* si_socketpair */ local_shutdown /* si_shutdown */ #ifdef CONFIG_NET_SOCKOPTS , local_getsockopt /* si_getsockopt */ , local_setsockopt /* si_setsockopt */ #endif }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: local_sockif_alloc * * Description: * Allocate and attach a local, Unix domain connection structure. * ****************************************************************************/ #if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM) static int local_sockif_alloc(FAR struct socket *psock) { /* Allocate the local connection structure */ FAR struct local_conn_s *conn = local_alloc(); if (conn == NULL) { /* Failed to reserve a connection structure */ return -ENOMEM; } /* Set the reference count on the connection structure. This reference * count will be incremented only if the socket is dup'ed */ DEBUGASSERT(conn->lc_crefs == 0); conn->lc_crefs = 1; /* Save the pre-allocated connection in the socket structure */ psock->s_conn = conn; #if defined(CONFIG_NET_LOCAL_STREAM) conn->lc_psock = psock; #endif return OK; } #endif /**************************************************************************** * Name: local_setup * * Description: * Called for socket() to verify that the provided socket type and * protocol are usable by this address family. Perform any family- * specific socket fields. * * Input Parameters: * psock A pointer to a user allocated socket structure * to be initialized. * protocol (see sys/socket.h) * * Returned Value: * Zero (OK) is returned on success. Otherwise, a negated errno value is * returned. * ****************************************************************************/ static int local_setup(FAR struct socket *psock, int protocol) { /* Allocate the appropriate connection structure. This reserves the * connection structure, it is unallocated at this point. It will not * actually be initialized until the socket is connected. * * REVISIT: Only SOCK_STREAM and SOCK_DGRAM are supported. Should also * support SOCK_RAW. */ switch (psock->s_type) { #ifdef CONFIG_NET_LOCAL_STREAM case SOCK_STREAM: if (protocol != 0 && protocol != IPPROTO_TCP) { return -EPROTONOSUPPORT; } /* Allocate and attach the local connection structure */ return local_sockif_alloc(psock); #endif /* CONFIG_NET_LOCAL_STREAM */ #ifdef CONFIG_NET_LOCAL_DGRAM case SOCK_DGRAM: if (protocol != 0 && protocol != IPPROTO_UDP) { return -EPROTONOSUPPORT; } /* Allocate and attach the local connection structure */ return local_sockif_alloc(psock); #endif /* CONFIG_NET_LOCAL_DGRAM */ default: return -EPROTONOSUPPORT; } } /**************************************************************************** * Name: local_sockcaps * * Description: * Return the bit encoded capabilities of this socket. * * Input Parameters: * psock - Socket structure of the socket whose capabilities are being * queried. * * Returned Value: * The set of socket cababilities is returned. * ****************************************************************************/ static sockcaps_t local_sockcaps(FAR struct socket *psock) { return SOCKCAP_NONBLOCKING; } /**************************************************************************** * Name: local_addref * * Description: * Increment the reference count on the underlying connection structure. * * Input Parameters: * psock - Socket structure of the socket whose reference count will be * incremented. * * Returned Value: * None * ****************************************************************************/ static void local_addref(FAR struct socket *psock) { FAR struct local_conn_s *conn; DEBUGASSERT(psock != NULL && psock->s_conn != NULL && psock->s_domain == PF_LOCAL); conn = psock->s_conn; DEBUGASSERT(conn->lc_crefs > 0 && conn->lc_crefs < 255); conn->lc_crefs++; } /**************************************************************************** * Name: local_bind * * Description: * local_bind() gives the socket 'psock' the local address 'addr'. 'addr' * is 'addrlen' bytes long. Traditionally, this is called "assigning a * name to a socket." When a socket is created with socket(), it exists * in a name space (address family) but has no name assigned. * * Input Parameters: * psock Socket structure of the socket to bind * addr Socket local address * addrlen Length of 'addr' * * Returned Value: * 0 on success; A negated errno value is returned on failure. See * bind() for a list a appropriate error values. * ****************************************************************************/ static int local_bind(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen) { int ret; /* Verify that a valid address has been provided */ if (addr->sa_family != AF_LOCAL || addrlen < sizeof(sa_family_t)) { nerr("ERROR: Invalid address length: %d < %zu\n", addrlen, sizeof(sa_family_t)); return -EBADF; } /* Perform the binding depending on the protocol type */ switch (psock->s_type) { /* Bind a local TCP/IP stream or datagram socket */ #if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM) #ifdef CONFIG_NET_LOCAL_STREAM case SOCK_STREAM: #endif #ifdef CONFIG_NET_LOCAL_DGRAM case SOCK_DGRAM: #endif { /* Bind the Unix domain connection structure */ ret = psock_local_bind(psock, addr, addrlen); } break; #endif /* CONFIG_NET_LOCAL_STREAM || CONFIG_NET_LOCAL_DGRAM */ default: ret = -EBADF; break; } return ret; } /**************************************************************************** * Name: local_getsockname * * Description: * The local_getsockname() function retrieves the locally-bound name of * the specified local socket, stores this address in the sockaddr * structure pointed to by the 'addr' argument, and stores the length of * this address in the object pointed to by the 'addrlen' argument. * * If the actual length of the address is greater than the length of the * supplied sockaddr structure, the stored address will be truncated. * * If the socket has not been bound to a local name, the value stored in * the object pointed to by address is unspecified. * * Input Parameters: * psock Socket structure of the socket to be queried * addr sockaddr structure to receive data [out] * addrlen Length of sockaddr structure [in/out] * * Returned Value: * On success, 0 is returned, the 'addr' argument points to the address * of the socket, and the 'addrlen' argument points to the length of the * address. Otherwise, a negated errno value is returned. See * getsockname() for the list of appropriate error numbers. * ****************************************************************************/ static int local_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen) { FAR struct sockaddr_un *unaddr = (FAR struct sockaddr_un *)addr; FAR struct local_conn_s *conn; DEBUGASSERT(psock != NULL && psock->s_conn != NULL && unaddr != NULL && addrlen != NULL); if (*addrlen < sizeof(sa_family_t)) { /* This is apparently not an error */ *addrlen = 0; return OK; } conn = (FAR struct local_conn_s *)psock->s_conn; /* Save the address family */ unaddr->sun_family = AF_LOCAL; if (*addrlen > sizeof(sa_family_t)) { /* Now copy the address description. */ if (conn->lc_type == LOCAL_TYPE_UNNAMED) { /* Zero-length sun_path... This is an abstract Unix domain socket */ *addrlen = sizeof(sa_family_t); } else /* conn->lc_type = LOCAL_TYPE_PATHNAME */ { /* Get the full length of the socket name (incl. null terminator) */ size_t namelen = strlen(conn->lc_path) + 1 + (conn->lc_type == LOCAL_TYPE_ABSTRACT); /* Get the available length in the user-provided buffer. */ size_t pathlen = *addrlen - sizeof(sa_family_t); /* Clip the socket name size so that if fits in the user buffer */ if (pathlen < namelen) { namelen = pathlen; } /* Copy the path into the user address structure */ if (conn->lc_type == LOCAL_TYPE_ABSTRACT) { unaddr->sun_path[0] = '\0'; strlcpy(&unaddr->sun_path[1], conn->lc_path, namelen - 1); } else { strlcpy(unaddr->sun_path, conn->lc_path, namelen); } *addrlen = sizeof(sa_family_t) + namelen; } } return OK; } /**************************************************************************** * Name: local_getpeername * * Description: * The local_getpeername() function retrieves the remote-connected name of * the specified local socket, stores this address in the sockaddr * structure pointed to by the 'addr' argument, and stores the length of * this address in the object pointed to by the 'addrlen' argument. * * If the actual length of the address is greater than the length of the * supplied sockaddr structure, the stored address will be truncated. * * If the socket has not been bound to a local name, the value stored in * the object pointed to by address is unspecified. * * Parameters: * psock Socket structure of the socket to be queried * addr sockaddr structure to receive data [out] * addrlen Length of sockaddr structure [in/out] * * Returned Value: * On success, 0 is returned, the 'addr' argument points to the address * of the socket, and the 'addrlen' argument points to the length of the * address. Otherwise, a negated errno value is returned. See * getpeername() for the list of appropriate error numbers. * ****************************************************************************/ static int local_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen) { return local_getsockname(psock, addr, addrlen); } #ifdef CONFIG_NET_SOCKOPTS /**************************************************************************** * Name: local_getsockopt * * Description: * local_getsockopt() retrieve the value for the option specified by the * 'option' argument at the protocol level specified by the 'level' * argument. If the size of the option value is greater than 'value_len', * the value stored in the object pointed to by the 'value' argument will * be silently truncated. Otherwise, the length pointed to by the * 'value_len' argument will be modified to indicate the actual length * of the 'value'. * * The 'level' argument specifies the protocol level of the option. To * retrieve options at the socket level, specify the level argument as * SOL_SOCKET. * * See a complete list of values for the 'option' argument. * * Input Parameters: * psock Socket structure of the socket to query * level Protocol level to set the option * option identifies the option to get * value Points to the argument value * value_len The length of the argument value * ****************************************************************************/ static int local_getsockopt(FAR struct socket *psock, int level, int option, FAR void *value, FAR socklen_t *value_len) { DEBUGASSERT(psock != NULL && psock->s_conn != NULL && psock->s_domain == PF_LOCAL); #ifdef CONFIG_NET_LOCAL_SCM if (level == SOL_SOCKET && option == SO_PEERCRED) { FAR struct local_conn_s *conn = psock->s_conn; if (*value_len != sizeof(struct ucred)) { return -EINVAL; } memcpy(value, &conn->lc_peer->lc_cred, sizeof(struct ucred)); return OK; } #endif return -ENOPROTOOPT; } /**************************************************************************** * Name: local_setsockopt * * Description: * local_setsockopt() sets the option specified by the 'option' argument, * at the protocol level specified by the 'level' argument, to the value * pointed to by the 'value' argument for the usrsock connection. * * The 'level' argument specifies the protocol level of the option. To set * options at the socket level, specify the level argument as SOL_SOCKET. * * See a complete list of values for the 'option' argument. * * Input Parameters: * psock Socket structure of the socket to query * level Protocol level to set the option * option identifies the option to set * value Points to the argument value * value_len The length of the argument value * ****************************************************************************/ static int local_setsockopt(FAR struct socket *psock, int level, int option, FAR const void *value, socklen_t value_len) { return -ENOPROTOOPT; } #endif /**************************************************************************** * Name: local_listen * * Description: * To accept connections, a socket is first created with psock_socket(), a * willingness to accept incoming connections and a queue limit for * incoming connections are specified with psock_listen(), and then the * connections are accepted with psock_accept(). For the case of local * unix sockets, psock_listen() calls this function. The psock_listen() * call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET. * * Input Parameters: * psock Reference to an internal, boound socket structure. * backlog The maximum length the queue of pending connections may grow. * If a connection request arrives with the queue full, the client * may receive an error with an indication of ECONNREFUSED or, * if the underlying protocol supports retransmission, the request * may be ignored so that retries succeed. * * Returned Value: * On success, zero is returned. On error, a negated errno value is * returned. See listen() for the set of appropriate error values. * ****************************************************************************/ #ifndef CONFIG_NET_LOCAL_STREAM int local_listen(FAR struct socket *psock, int backlog) { return -EOPNOTSUPP; } #endif /**************************************************************************** * Name: local_connect * * Description: * local_connect() connects the local socket referred to by the structure * 'psock' to the address specified by 'addr'. The addrlen argument * specifies the size of 'addr'. The format of the address in 'addr' is * determined by the address space of the socket 'psock'. * * If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address * to which datagrams are sent by default, and the only address from which * datagrams are received. If the socket is of type SOCK_STREAM or * SOCK_SEQPACKET, this call attempts to make a connection to the socket * that is bound to the address specified by 'addr'. * * Generally, connection-based protocol sockets may successfully * local_connect() only once; connectionless protocol sockets may use * local_connect() multiple times to change their association. * Connectionless sockets may dissolve the association by connecting to * an address with the sa_family member of sockaddr set to AF_UNSPEC. * * Input Parameters: * psock Pointer to a socket structure initialized by psock_socket() * addr Server address (form depends on type of socket) * addrlen Length of actual 'addr' * * Returned Value: * 0 on success; a negated errno value on failure. See connect() for the * list of appropriate errno values to be returned. * ****************************************************************************/ static int local_connect(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen) { /* Verify that a valid address has been provided */ if (addr->sa_family != AF_LOCAL || addrlen < sizeof(sa_family_t)) { return -EBADF; } /* Perform the connection depending on the protocol type */ switch (psock->s_type) { #ifdef CONFIG_NET_LOCAL_STREAM case SOCK_STREAM: { FAR struct socket_conn_s *conn = psock->s_conn; /* Verify that the socket is not already connected */ if (_SS_ISCONNECTED(conn->s_flags)) { return -EISCONN; } /* It's not... Connect to the local Unix domain server */ return psock_local_connect(psock, addr); } break; #endif /* CONFIG_NET_LOCAL_STREAM */ #ifdef CONFIG_NET_LOCAL_DGRAM case SOCK_DGRAM: { /* Perform the datagram connection logic */ #warning Missing logic return -ENOSYS; } break; #endif /* CONFIG_NET_LOCAL_DGRAM */ default: return -EBADF; } } /**************************************************************************** * Name: local_accept * * Description: * The pkt_accept function is used with connection-based socket types * (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first * connection request on the queue of pending connections, creates a new * connected socket with mostly the same properties as 'sockfd', and * allocates a new socket descriptor for the socket, which is returned. The * newly created socket is no longer in the listening state. The original * socket 'sockfd' is unaffected by this call. Per file descriptor flags * are not inherited across an pkt_accept. * * The 'sockfd' argument is a socket descriptor that has been created with * socket(), bound to a local address with bind(), and is listening for * connections after a call to listen(). * * On return, the 'addr' structure is filled in with the address of the * connecting entity. The 'addrlen' argument initially contains the size * of the structure pointed to by 'addr'; on return it will contain the * actual length of the address returned. * * If no pending connections are present on the queue, and the socket is * not marked as non-blocking, pkt_accept blocks the caller until a * connection is present. If the socket is marked non-blocking and no * pending connections are present on the queue, pkt_accept returns * EAGAIN. * * Input Parameters: * psock Reference to the listening socket structure * addr Receives the address of the connecting client * addrlen Input: allocated size of 'addr', * Return: returned size of 'addr' * newsock Location to return the accepted socket information. * * Returned Value: * Returns 0 (OK) on success. On failure, it returns a negated errno * value. See accept() for a description of the appropriate error value. * * Assumptions: * The network is locked. * ****************************************************************************/ #ifndef CONFIG_NET_LOCAL_STREAM static int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen, FAR struct socket *newsock) { return -EAFNOSUPPORT; } #endif /**************************************************************************** * Name: local_poll * * Description: * The standard poll() operation redirects operations on socket descriptors * to local_poll which, indiectly, calls to function. * * Input Parameters: * psock - An instance of the internal socket structure. * fds - The structure describing the events to be monitored, OR NULL if * this is a request to stop monitoring events. * setup - true: Setup up the poll; false: Teardown the poll * * Returned Value: * 0: Success; Negated errno on failure * ****************************************************************************/ static int local_poll(FAR struct socket *psock, FAR struct pollfd *fds, bool setup) { /* Check if we are setting up or tearing down the poll */ if (setup) { /* Perform the TCP/IP poll() setup */ return local_pollsetup(psock, fds); } else { /* Perform the TCP/IP poll() teardown */ return local_pollteardown(psock, fds); } } /**************************************************************************** * Name: local_close * * Description: * Performs the close operation on a local, Unix socket instance * * Input Parameters: * psock Socket instance * * Returned Value: * 0 on success; a negated errno value is returned on any failure. * * Assumptions: * ****************************************************************************/ static int local_close(FAR struct socket *psock) { /* Perform some pre-close operations for the local address type */ switch (psock->s_type) { #if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM) #ifdef CONFIG_NET_LOCAL_STREAM case SOCK_STREAM: #endif #ifdef CONFIG_NET_LOCAL_DGRAM case SOCK_DGRAM: #endif { FAR struct local_conn_s *conn = psock->s_conn; /* Is this the last reference to the connection structure (there * could be more if the socket was dup'ed). */ if (conn->lc_crefs <= 1) { conn->lc_crefs = 0; local_release(conn); } else { /* No.. Just decrement the reference count */ conn->lc_crefs--; } return OK; } #endif /* CONFIG_NET_LOCAL_STREAM || CONFIG_NET_LOCAL_DGRAM */ default: return -EBADF; } } /**************************************************************************** * Name: local_ioctl * * Description: * This function performs local device specific operations. * * Parameters: * psock A reference to the socket structure of the socket * cmd The ioctl command * arg The argument of the ioctl cmd * ****************************************************************************/ static int local_ioctl(FAR struct socket *psock, int cmd, unsigned long arg) { FAR struct local_conn_s *conn; int ret = OK; conn = (FAR struct local_conn_s *)psock->s_conn; switch (cmd) { case FIONBIO: if (conn->lc_infile.f_inode != NULL) { ret = file_ioctl(&conn->lc_infile, cmd, arg); } if (ret >= 0 && conn->lc_outfile.f_inode != NULL) { ret = file_ioctl(&conn->lc_outfile, cmd, arg); } break; case FIONREAD: if (conn->lc_infile.f_inode != NULL) { ret = file_ioctl(&conn->lc_infile, cmd, arg); } else { ret = -ENOTCONN; } break; case FIONWRITE: case FIONSPACE: if (conn->lc_outfile.f_inode != NULL) { ret = file_ioctl(&conn->lc_outfile, cmd, arg); } else { ret = -ENOTCONN; } break; case BIOC_FLUSH: ret = -EINVAL; break; default: ret = -ENOTTY; break; } return ret; } /**************************************************************************** * Name: local_socketpair * * Description: * Create a pair of connected sockets between psocks[2] * * Parameters: * psocks A reference to the socket structure of the socket pair * ****************************************************************************/ static int local_socketpair(FAR struct socket *psocks[2]) { #if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM) FAR struct local_conn_s *conns[2]; #ifdef CONFIG_NET_LOCAL_STREAM bool nonblock; int ret; #endif /* CONFIG_NET_LOCAL_STREAM */ int i; for (i = 0; i < 2; i++) { conns[i] = psocks[i]->s_conn; snprintf(conns[i]->lc_path, sizeof(conns[i]->lc_path), "socketpair%p", psocks[0]); conns[i]->lc_proto = psocks[i]->s_type; conns[i]->lc_type = LOCAL_TYPE_PATHNAME; conns[i]->lc_state = LOCAL_STATE_BOUND; } #ifdef CONFIG_NET_LOCAL_DGRAM #ifdef CONFIG_NET_LOCAL_STREAM if (psocks[0]->s_type == SOCK_DGRAM) #endif /* CONFIG_NET_LOCAL_STREAM */ { return OK; } #endif /* CONFIG_NET_LOCAL_DGRAM */ #ifdef CONFIG_NET_LOCAL_STREAM conns[0]->lc_instance_id = conns[1]->lc_instance_id = local_generate_instance_id(); /* Create the FIFOs needed for the connection */ ret = local_create_fifos(conns[0]); if (ret < 0) { goto errout; } nonblock = _SS_ISNONBLOCK(conns[0]->lc_conn.s_flags); /* Open the client-side write-only FIFO. */ ret = local_open_client_tx(conns[0], nonblock); if (ret < 0) { goto errout; } /* Open the server-side read-only FIFO. */ ret = local_open_server_rx(conns[1], nonblock); if (ret < 0) { goto errout; } /* Open the server-side write-only FIFO. */ ret = local_open_server_tx(conns[1], nonblock); if (ret < 0) { goto errout; } /* Open the client-side read-only FIFO */ ret = local_open_client_rx(conns[0], nonblock); if (ret < 0) { goto errout; } conns[0]->lc_state = conns[1]->lc_state = LOCAL_STATE_CONNECTED; return OK; errout: local_release_fifos(conns[0]); return ret; #endif /* CONFIG_NET_LOCAL_STREAM */ #else return -EOPNOTSUPP; #endif /* CONFIG_NET_LOCAL_STREAM || CONFIG_NET_LOCAL_DGRAM */ } /**************************************************************************** * Name: local_shutdown * * Description: * The shutdown() function will cause all or part of a full-duplex * connection on the socket associated with the file descriptor socket to * be shut down. * * The shutdown() function disables subsequent send and/or receive * operations on a socket, depending on the value of the how argument. * * Input Parameters: * sockfd - Specifies the file descriptor of the socket. * how - Specifies the type of shutdown. The values are as follows: * * SHUT_RD - Disables further receive operations. * SHUT_WR - Disables further send operations. * SHUT_RDWR - Disables further send and receive operations. * ****************************************************************************/ static int local_shutdown(FAR struct socket *psock, int how) { DEBUGASSERT(psock != NULL && psock->s_conn != NULL && psock->s_domain == PF_LOCAL); switch (psock->s_type) { #ifdef CONFIG_NET_LOCAL_STREAM case SOCK_STREAM: { FAR struct local_conn_s *conn = psock->s_conn; if (how & SHUT_RD) { if (conn->lc_infile.f_inode != NULL) { file_close(&conn->lc_infile); conn->lc_infile.f_inode = NULL; } } if (how & SHUT_WR) { if (conn->lc_outfile.f_inode != NULL) { file_close(&conn->lc_outfile); conn->lc_outfile.f_inode = NULL; } } } return OK; #endif #ifdef CONFIG_NET_LOCAL_DGRAM case SOCK_DGRAM: return -EOPNOTSUPP; #endif default: return -EBADF; } } /**************************************************************************** * Public Functions ****************************************************************************/ #endif /* CONFIG_NET_LOCAL */